Many insect species can be found at North Warren, with large numbers of dragonfly and butterfly in summer months (northern hemisphere), including the nationally rare silver-studded blue. In 2007, an invasive insect pest, the wheat bug Nysius huttoni, was found at North Warren for the first time in the UK. Originally from New Zealand the insect feeds on weeds and crop plants and has since been found at other sites in the UK.[5]
The reserve is open year-round with no fee and provides no additional facilities, there is a nearby pay and display car park and public toilets in Aldeburgh. The trails within the reserve are unpaved and may be unsuitable for wheelchair and buggy users, however much of the reed beds are viewable from the paved path alongside the road next to the reserve. Dogs, other than assistance dogs are only allowed on the public rights of way.[13]
History
The original North Warren reserve comprising 37 hectares (91 acres) was purchased by the RSPB in 1939 due to interest in its breeding bird populations. In subsequent years the reserve has expanded as land has become available for purchase and now covers 443 hectares (1,090 acres). During World War II, pillboxes and trenches were constructed on the heath and tank traps were placed across the marshes as part of the British coastal defences.[4]